1. Yiran Zhou and Yaowu Chen: submitted to Journal of HuaZhong university of science and technology. Vol. 39(2011), p.6 (in chinese).
2. S. Eminsoy and S. Dogan: submitted to EURASIP Journal on Advances in Signal Processing(2007).
3. P. Nunes and L. D. Soares: submitted to IEEE, ICIP(2009).
4. P. Nunes and L. D. Soares: submitted to IEEE, ICIP(2008).
5. Jing Xu, Zhimei Wu and Puwei Huang: submitted to Journal of computer aided design and graphics, Vol. 19(2007), p.84 (in chinese).